Songs in ceremony

Two songs for the processional and one for the recessional.

Two processional songs and one for recessional. Some people do a song when there's something like a unity ceremony

Two songs for processional; one for wedding party and one for me then one recessional song.

Definitely no need for a song in the middle of the ceremony. (Not even sure how that would work— feels like it would break up the flow)

we only had processional and recessional music— though actually, they were the same song! Just different parts

It depends on the type and style of the ceremony. Most people have about 4 or 5 songs.
Guests Entrance, bridal party entrance, bride entrance, exit of bride groom.
Some people have a different song for seating of mothers and a different song for when the bridal party and guests exit at the end of the ceremony.